博碩士論文 995301012 詳細資訊




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姓名 梁晨璋(Chen-Zhang Liang)  查詢紙本館藏   畢業系所 電機工程學系在職專班
論文名稱 有限元素分析法於聽診器之聲波模擬
(Acoustic wave simulation in stethoscope using finite element analysis)
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摘要(中) 聽診器(stethoscope),為醫生在進行臨床診斷時最重要的工具之一,其優點為以非侵入式的診斷,用作聽取人體內心、肺、胃腸等臟器發出的聲響,進而判斷人體的病症。聽診器自1816年由法國醫生R. Laennec發明以來,到現今經過了將近兩個世紀的演進,從過去早期的鐘式(bell)聽診器到結合麥克風感測元件的電子式聽診器。由於現代電腦科技的發達,近年來電子式聽診器已逐漸發展為電腦化的醫療輔具,透過電腦數位訊號分析的方式,可更快速的協助醫生進行診斷。
以訊號處理系統而言,電子式聽診器內傳遞聲波的部件可視為一聲波感測元件,其本身對於聲波帶有頻率響應特性,會影響量測端訊號的變化,且醫生在進行臨床量測時,容易受到磨擦音和環境噪音的干擾,醫生在進行聽診時可判別其與人體內聲響的差異,但在訊號分析時卻不易分辨,尤其當干擾訊號與病症訊號落在相同的頻帶時,電腦會有誤判的情形,故為了解決此訊號處理上的問題,本研究利用有限元素分析法(Finite element analysis, FEA)之套裝軟體來模擬聽診器的聲波特性,希望能藉此以科學的方式來取得更好的聽診器外形和材料之設計參數。
在模擬驗證的部份,本研究以聲學系統之集總參數模型(lumped-parameter model)為基礎,探討聲波元件的頻率響應變化,並以自製的電腦量測介面,以實物量測的方式測量聽診器實物的頻率響應,驗證軟體模擬的結果。
摘要(英) The stethoscope, doctor in one of the most important tools in clinical diagnosis, and its advantages for the non-invasive diagnosis, used as a hearing body sound created by heart, lungs, gastrointestinal tract and other organs so as to determine the body′s disease. Stethoscope since 1816 was invented by French doctor R. Laennec. Now, after nearly two centuries of evolution, from the past early bell stethoscope to present combine sensing component of electronic stethoscope. Due to the development of modern computer technology, electronic stethoscope has in recent years developed into the computerized medical aids, by the way of digital signal analysis using computer, could help doctors diagnose more quickly.
In terms of signal processing systems, electronic stethoscopes can be regarded as a sensing component of acoustic wave, its acoustic frequency response will affect the measurement signal changes. And when doctors conduct clinical measurement will easily be friction sound and environmental noise interference. Doctors in the auscultate may identify noise and the body sound differences, but on the signal analysis using computer, it did not distinguish, especially when external noise and symptoms signals on the same frequency band, the computer will be prone to error of judgment. Therefore, in order to solve these problems on signal processing. This research using the software of finite element analysis (FEA) to simulate the acoustic characteristics of stethoscopes, hoping to achieve better stethoscope design parameters of shapes and materials.
Part in the simulation verification, this research is based on lumped-parameter model of the acoustic system, to explore changes in the frequency response of the acoustic component, and using physical measurements of the interface, measured acoustic frequency response of stethoscope to verify the results of the simulation.
關鍵字(中) ★ 聽診器
★ 有限元素分析法
★ 流固耦合
★ 聲學
關鍵字(英) ★ Stethoscope
★ FEA
★ FSI
★ Acoustic
論文目次 中文摘要 i
Abstract ii
致謝 iii
目錄 iv
圖目錄 v
表目錄 vii
第一章 緒論 - 1 -
1.1. 聽診器發展簡介 - 1 -
1.1.1. 現代聽診器的外型 - 1 -
1.1.2. 聽診器的發展 - 2 -
1.1.3. 電子式聽診器與電腦化發展 - 3 -
1.2. 研究動機 - 5 -
1.3. 有限元素分析簡介 - 7 -
1.4. 文獻回顧 - 8 -
第二章 聲學之有限元素分析 - 11 -
2.1. 有限元素分析基本步驟 - 11 -
2.2. 聲學基本原理 - 13 -
2.3. 有限元素分析法之流固耦合支配方程式 - 16 -
2.4. 軟體分析流程 - 21 -
第三章 赫姆霍茲諧振器之聲波模擬 - 29 -
3.1. 聲學系統之集總參數模型 - 29 -
3.2. 赫姆霍茲諧振器之集總參數模型 - 32 -
3.3. 赫姆霍茲諧振器之建模與分析 - 33 -
3.3.1. 階段一、描述問題 - 33 -
3.3.2. 階段二、進行ANSYS分析 - 34 -
3.3.3. 階段三、結果與討論 - 42 -
第四章 聽診器之聲波模擬 - 45 -
4.1. 未加隔膜之聽診器聲波模擬 - 45 -
4.2. 聽診器實物量測驗證 - 57 -
4.2.1. 聽診器實物量測之系統架構 - 57 -
4.2.2. 自製音頻電路 - 60 -
4.2.3. 量測方法與量測結果 - 63 -
4.3. 加上隔膜之聽診器聲波模擬與驗證 - 64 -
第五章 結論與未來展望 - 78 -
參考文獻 - 81 -
附錄A 赫姆霍茲諧振器分析之APDL程式 - 83 -
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指導教授 蔡章仁(Jang-Zern Tsai) 審核日期 2014-7-31
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